fix docstr of anchor head

[jshilong]

fix the docstring of get_bboxes in anchor_head.py.

[codecov]

Codecov Report

Merging #4883 (59e1648) into master (ff38f20) will decrease coverage by 0.90%.
The diff coverage is 85.71%.

❗ Current head 59e1648 differs from pull request most recent head d988203. Consider uploading reports for the commit d988203 to get more accurate results

@@            Coverage Diff             @@
##           master    #4883      +/-   ##
==========================================
- Coverage   65.45%   64.55%   -0.91%     
==========================================
  Files         255      255              
  Lines       19981    19888      -93     
  Branches     3398     3398              
==========================================
- Hits        13079    12839     -240     
- Misses       6200     6346     +146     
- Partials      702      703       +1     

Flag	Coverage Δ
unittests	64.55% <85.71%> (-0.87%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet/models/dense_heads/anchor_head.py	83.91% <85.71%> (-3.92%)	⬇️
mmdet/models/necks/yolo_neck.py	63.46% <0.00%> (-36.54%)	⬇️
mmdet/models/dense_heads/yolo_head.py	30.54% <0.00%> (-31.41%)	⬇️
mmdet/core/post_processing/bbox_nms.py	74.24% <0.00%> (-13.64%)	⬇️
mmdet/models/roi_heads/test_mixins.py	39.86% <0.00%> (-9.16%)	⬇️
mmdet/models/dense_heads/rpn_test_mixin.py	77.41% <0.00%> (-6.46%)	⬇️
mmdet/models/detectors/cornernet.py	94.87% <0.00%> (-5.13%)	⬇️
mmdet/datasets/pipelines/transforms.py	69.61% <0.00%> (-3.00%)	⬇️
mmdet/models/roi_heads/base_roi_head.py	82.85% <0.00%> (-2.86%)	⬇️
... and 39 more

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